Checking with Guest Services at any of the resorts is the only other way. They use to have a phone number you could call but that has been discontinued. ~~
I needed to check that last year and went to a Disney Store. They told me that the only way was to check at the park. I suppose that doesn't really help, but now you know the stores can't help! I finally found an itinerary that I made for my trip and figured it out that way! Good luck!
I was trying to find out the same thing for my parents. They had hopper passes from back in 1999 and are not really sure how much time is left. I called WDW main # and they told me that they could only tell you by computer down at the parks.